netbsd-INSTALL goes to prompt

When I try to boot from netbsd-INSTALL I get a prompt, not the installer, as I
used to see in NetBSD-i386. To get a installer, in order to update the system,
I need to boot from a boot.iso cdrom. Am I missing anything? My system is a
x86_em64t 5.99.3.
Thanks in advance.
mancasc
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